\begin{tikzpicture}
	\tkzDefPoints{0/0/B, 3/0/C, 0.8/1.5/A, 2.2/1.5/D}
    \tkzDrawPolygon(A,B,C,D)
    \tkzLabelPoints[left](A,B)
    \tkzLabelPoints[right](D,C)

    \tkzInterLL(B,A)(C,D)  \tkzGetPoint{E}
    \tkzDefLine[bisector](B,E,C)  \tkzGetPoint{f}
    \tkzInterLL(E,f)(B,C)  \tkzGetPoint{F}
    \tkzInterLL(E,f)(A,D)  \tkzGetPoint{G}
    \tkzDrawSegments[dashed](A,E  D,E)
    \tkzDrawSegments(E,F)
    \tkzMarkRightAngle(A,G,E)
    \tkzMarkRightAngle(B,F,E)
    \tkzLabelPoints[above](E)
    \tkzLabelPoints[below](F)
\end{tikzpicture}

